JP2015099715A - Water-saving combined power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly-efficient water-saving combined power generation system capable of being operated even in a region lacking in water sources.SOLUTION: A water-saving combined power generation system comprises: a gas turbine power generation system 11 including a compressor 12, a combustor 13, a turbine 14, and a power generator 15; a fuel cell 30; a fuel cell air pipe 32 for connecting the compressor 12 and the fuel cell 30; an exhaust fuel pipe 34 for connecting the fuel cell 30 and the combustor 13 and guiding the exhaust fuel of the fuel cell 30 to the combustor 13; a fuel cell outlet steam pipe 35 for connecting the fuel cell 30 and the combustor 13; a water recovery system 40 for recovering water from an exhaust gas of the turbine 14; an exhaust heat recovery boiler 20 for generating steam by heat-exchanging the water recovered by the water recovery system 40 and the exhaust gas of the turbine 14; and a combustor steam pipe 21 for connecting the exhaust heat recovery boiler 20 and the combustor 13 and adding the steam generated by the exhaust heat recovery boiler 20 to the compressed air supplied to the combustor 13.

Description

  The present invention relates to a water-saving combined power generation system including a solid oxide fuel cell and a gas turbine.

  A fuel cell is a power generation device that directly converts chemical energy of fuel into electrical energy, and is classified according to the type of electrolyte. Ceramics such as zirconia are used as electrolytes, and natural gas, petroleum, methanol, coal gasification gas, etc. are used as fuels. Solid oxide fuel cells (hereinafter referred to as “SOFC”) Called. Recently, a combined power generation system in which this SOFC is combined with a gas turbine has been proposed (see Patent Document 1).

JP 2004-60574 A

  In the combined power generation system of Patent Document 1, high efficiency is achieved by using the exhaust gas of the gas turbine as a heat generation source of steam that is a working medium of the steam turbine. Thus, the combined cycle in which the gas turbine and the steam turbine are combined requires a large amount of heat radiation source used in the condenser for returning the steam to the water. Since water is often used as a heat radiation source, the combined cycle is often constructed near a large river or sea. For this reason, the construction of a combined cycle is not suitable for areas where water resources are scarce. Even if the steam turbine is omitted in the combined power generation system of the same document, a large facility is required for processing the exhaust gas of the gas turbine, and the energy of the exhaust gas is wasted, resulting in poor efficiency.

  On the other hand, a system called AHAT (Advanced Humid Air Turbine) is known as a system that can achieve the same efficiency as a combined cycle without combining steam turbines. In AHAT, steam is generated using the exhaust gas of the gas turbine, and the generated steam is humidified with the compressed air of the gas turbine to improve combustion efficiency, and low-temperature cooling water is sprayed on the exhaust gas of the gas turbine. To condense the moisture of the exhaust gas. The water sprayed on the exhaust gas is obtained by cooling the condensate with a water cooler. For this reason, a large amount of water is required in equipment such as a water cooler, and it is difficult to operate in an area where water sources are scarce.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly efficient water-saving combined power generation system that can be operated even in an area where water sources are scarce.

  To achieve the above object, a water-saving combined power generation system according to the present invention includes a compressor, a combustor, a gas turbine power generation system having a turbine and a generator, a fuel cell, the compressor, and the fuel cell. A fuel cell air pipe for supplying compressed air to the fuel cell, connecting the fuel cell and the combustor, and connecting the fuel cell to the combustor, and a fuel cell A fuel cell outlet steam pipe connected to the combustor and adding steam generated in the fuel cell to compressed air supplied to the combustor; a moisture recovery system for recovering moisture from the exhaust gas of the turbine; An exhaust heat recovery boiler that generates steam by exchanging heat between the moisture recovered by the moisture recovery system and the exhaust gas of the turbine; and the exhaust heat recovery boiler connected to the exhaust heat recovery boiler and the combustor The steam generated by Ira and a combustor steam pipe to be added to the compressed air supplied to the combustor.

  According to the present invention, power can be generated with high efficiency even in an area where water sources are scarce.

1 is a system diagram of a water-saving combined power generation system according to a first embodiment of the present invention. It is a system diagram of a water-saving combined power generation system according to a second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
1. Water-saving combined power generation system FIG. 1 is a system diagram of a water-saving combined power generation system according to a first embodiment of the present invention.

  The water-saving combined power generation system includes a gas turbine power generation system 10, an exhaust heat recovery boiler 20, a fuel cell 30, a moisture recovery system 40, a reheater 50, a gas turbine side valve group, and a fuel cell side valve group. Each component will be described below.

2. Gas Turbine Power Generation System The gas turbine power generation system 10 includes a gas turbine 11 and a generator 15. The gas turbine 11 includes a compressor 12, a combustor 13, and a turbine 14. The compressor 12 is connected to the turbine 14 via a shaft, and the generator 15 is connected to the compressor 12 via a shaft. However, the generator 15 may be connected to the turbine 14. In the present embodiment, the configuration in which the compressor 12, the turbine 14 and the generator 15 are coaxially connected is illustrated, but a plurality of turbines (for example, a low pressure turbine and a high pressure turbine) that can rotate at different rotational speeds are illustrated. When the turbine 14 is configured, the shaft may be separated by, for example, a gas generator composed of a low-pressure turbine and a compressor 12 and an output turbine composed of a high-pressure turbine and a generator 15.

  In the gas turbine power generation system 10 configured as described above, compressed air generated by compressing the intake air by the compressor 12 is supplied to the combustor 13, and fuel is combusted together with the compressed air by the combustor 13 to generate combustion gas. The rotational power of the turbine 14 is obtained by this combustion gas. A part of the rotational power of the turbine 14 is used for power of the compressor 12, and part of the rotational power is used for power of the generator 15 to be converted into electric energy.

  In the present specification, a fuel pipe that supplies fuel (natural gas or the like) to the combustor 13 is referred to as a combustor fuel pipe 16. A pipe that supplies compressed air from the compressor 12 to the combustor 13 is referred to as a combustor air pipe 17.

3. Exhaust Heat Recovery Boiler The exhaust heat recovery boiler 20 is a device that generates steam by exchanging heat of the moisture recovered by the moisture recovery system 40 with the exhaust gas of the turbine 14. The exhaust heat recovery boiler 20 is connected to a turbine 14 and a moisture recovery device 41 (described later) of the moisture recovery system 40 via a pipe. The exhaust gas of the turbine 14 is introduced as a heat source and discharged to the moisture recovery device 41. Is done. The exhaust heat recovery boiler 20 is also connected to the combustor 13 and the steam customer 91 via a combustor steam pipe 21 and a steam distribution pipe 22, respectively. That is, part of the steam generated in the exhaust heat recovery boiler 20 is added to the compressed air supplied to the combustor 13 via the combustor steam pipe 21, and the surplus is supplied to the steam customer 91 as process steam. Is done. The steam customer 91 is, for example, equipment such as a steam turbine, a factory, and other steam users.

  In FIG. 1, the combustor steam pipe 21 is connected to the combustor air pipe 17, and the exhaust heat recovery boiler 20 and the combustor 13 are connected via the combustor steam pipe 21 and the combustor air pipe 17. However, the combustor steam pipe 21 may be directly connected to the combustor 13.

4). Fuel Cell The fuel cell 30 is a device that extracts electric power by an electrochemical reaction using a fuel (natural gas or the like) and an oxidant (air or the like). Although the type is not necessarily limited, the present embodiment employs a solid oxide fuel cell (SOFC) having a high operating temperature. The fuel cell 30 is connected to a fuel source (not shown) and the compressor 12 via a fuel cell fuel pipe 31 and a fuel cell air pipe 32, respectively. The fuel cell fuel tube 31 is connected to the fuel electrode of the fuel cell 30, and fuel from the fuel source is supplied to the fuel electrode via the fuel cell fuel tube 31. The fuel cell air tube 32 is connected to the air electrode of the fuel cell 30, and compressed air from the compressor 12 is supplied to the air electrode via the fuel cell air tube 32. A blower 33 is provided in the fuel cell air pipe 32. The fuel cell 30 is also connected to the combustor 13 via an exhaust fuel pipe 34 and a fuel cell outlet steam pipe 35. The exhaust fuel pipe 34 connects the fuel electrode of the fuel cell 30 and a fuel nozzle (not shown) of the combustor 13, and the exhaust fuel (residual fuel) discharged from the fuel electrode passes through the exhaust fuel pipe 34. Supplied to the nozzle. The fuel cell outlet steam pipe 35 connects the air electrode of the fuel cell 30 and the combustor air pipe 17, and compressed air from which steam generated at the air electrode by an electrochemical reaction in a high temperature environment is supplied to the combustor 13. Is added via a fuel cell outlet steam pipe 35.

5. Moisture Recovery System The moisture recovery system 40 is a system that recovers moisture from the exhaust gas of the turbine 14, and includes a moisture recovery device 41, a radiator 42, a water treatment facility 43, and a water storage tank 44.

  The moisture recovery device 41 is a device that recovers the moisture of the exhaust gas of the turbine 14 that has passed through the exhaust heat recovery boiler 20, and the type of the device is not necessarily limited, but in the present embodiment, the cooling water is exposed to the exhaust gas. Therefore, a condensate tower that condenses moisture contained in the exhaust gas is adopted. The moisture recovery device 41 is connected to the exhaust heat recovery boiler 20 and the reheater 50 through a pipe. The exhaust gas that has passed through the exhaust heat recovery boiler 20 is introduced, the moisture is recovered, and the reheater 50 is recovered. Is discharged. The moisture recovery device 41 is also connected to the radiator 42 via a water supply pipe 45, a refrigerant pipe 46 and a makeup water pipe 47. The water pipe 45 is provided with a pump that sends the recovered water to the radiator 42.

  The radiator 42 is an air-cooled radiator that cools the moisture collected by the moisture collection device 41, and cools the moisture introduced from the moisture collection device 41 through the water supply pipe 45 by atmospheric radiation. Part of the water cooled by the radiator 42 is supplied as a refrigerant to the water recovery device 41 via the refrigerant pipe 46 and sprayed to the exhaust gas, and part of the water is supplied to the water recovery device 41 via the makeup water pipe 47. Replenished to the water reservoir. Further, the radiator 42 is connected to the exhaust heat recovery boiler 20 via a water supply pipe 48. That is, a part of the water recovered by the water recovery device 41 is guided to the water supply pipe 48 through the water supply pipe 45 and the radiator 42 and supplied to the exhaust heat recovery boiler 20 as a steam source through the water supply pipe 48. The

  The water treatment equipment 43 and the water storage tank 44 are provided in the middle of the water supply pipe 48. The water supply pipe 48 is branched at a portion downstream of the water treatment equipment 43 and the water storage tank 44. This branch pipe connects the moisture recovery device 41 and the water consumer 92 as the moisture pipe 49 and plays a role of supplying the moisture recovered by the moisture recovery device 41 to the water consumer 92. The water treatment facility 43 is installed to purify the water supplied to the water consumer 92, and the water storage tank 44 temporarily stores the water flowing through the water supply pipe 48. The water consumers 92 are, for example, factories, farms, general households, stores, facilities, and other water users. A pump is provided in a portion of the water supply pipe 48 upstream of the branch portion of the moisture pipe 49, and fulfills the function of sending the recovered moisture to the exhaust heat recovery boiler 20 and the water consumer 92.

  In addition, although the heat radiator 42 is installed in the middle of the water supply pipe 48 and the water | moisture content which passed the heat radiator 42 is mentioned as an example and demonstrated, depending on conditions, It is also possible to change the piping configuration so that the moisture recovered by the moisture recovery device 41 is supplied to the exhaust heat recovery boiler 20 without passing through the radiator 42.

6). Reheater The reheater 50 reheats the exhaust gas of the turbine 14 that has passed through the moisture recovery device 41 to a specified temperature or higher. In the case of the configuration of FIG. 1, the exhaust gas that has passed through the moisture recovery device 41 does not particularly affect the environment even if it is released into the atmosphere without being reheated. When released, it may appear white smoke. The reheater 50 serves to suppress the apparent white smoke of the exhaust gas. The heat source of the reheater 50 is a part of the steam generated in the exhaust heat recovery boiler 20 and is guided through the exhaust heat recovery boiler 20 through the branch pipe 51 branched from the steam distribution pipe 22. The steam heated by the reheater 50 is returned to the exhaust heat recovery boiler 20.

7). Gas Turbine Side Valve Group The gas turbine side valve group includes valves 61 and 62 provided in the above-described combustor fuel pipe 16 and combustor air pipe 17, respectively. When the valve 61 is closed, the fuel supply to the combustor 13 via the combustor fuel pipe 16 is shut off. When the valve 62 is closed, the supply of compressed air from the compressor 12 to the combustor 13 is shut off. The valves 61 and 62 can be fully closed in addition to the opening adjustment function. Each valve may be composed of an opening adjustment valve and a shut-off valve.

8). Fuel Cell Side Valve Group The fuel cell side valve group includes valves 71 to 74 provided in the fuel cell fuel pipe 31, the fuel cell air pipe 32, the exhaust fuel pipe 34, and the fuel cell outlet steam pipe 35, respectively. When the valve 71 is closed, the supply of fuel to the fuel cell 30 via the fuel cell fuel pipe 31 is shut off. When the valve 72 is closed, the supply of compressed air to the fuel cell 30 is shut off. When the valve 73 is closed, the supply of exhaust fuel from the fuel cell 30 to the combustor 13 is shut off. When the valve 74 is closed, the supply of steam from the fuel cell 30 to the combustor 13 is shut off. In addition to the opening adjustment function, the valves 71-74 can be fully closed. Each valve may be composed of an opening adjustment valve and a shut-off valve.

9. Operation The operation of the water-saving combined power generation system configured as described above is as follows.

  First, in the gas turbine power generation system 10, the compressed air compressed by the compressor 12 is supplied to the combustor 13, and the compressed air is combusted together with the fuel supplied through the combustor fuel pipe 16 and the exhaust fuel pipe 34. 13 and the rotational power of the turbine 14 is obtained by the combustion gas. A part of the rotational power of the turbine 14 is used for power of the compressor 12, and part of the rotational power is used for power of the generator 15 to be converted into electric energy.

  On the other hand, a part of the compressed air generated by the compressor 12 is led to the fuel cell 30 via the fuel cell air pipe 32 and warms the fuel cell 30 at the time of startup. When the warming of the fuel cell 30 is completed, the valves 71, 73 and 74 are opened, and fuel and air are supplied to the fuel electrode and the air electrode of the fuel cell 30 through the fuel cell fuel tube 31 and the fuel cell air tube 32, respectively. . The fuel is vaporized in the fuel cell 30, and electric energy is extracted in the fuel cell 30 by an electrochemical reaction between the vaporized fuel and air. Exhaust fuel (surplus fuel) that has passed through the fuel electrode is supplied to the combustor 13 via the exhaust fuel pipe 34 and is effectively used as fuel for the combustor 13. On the other hand, the air that has passed through the air electrode becomes steam with moisture generated by an electrochemical reaction in a high temperature environment, and is supplied to the compressed air to the combustor 13 via the fuel cell outlet steam pipe 35, Used to increase output.

  The exhaust gas of the turbine 14 is guided to the exhaust heat recovery boiler 20, and the water recovered by the moisture recovery system 40 is heated by the exhaust heat recovery boiler 20 to generate steam. A part of the steam generated in the exhaust heat recovery boiler 20 is added to the compressed air supplied to the combustor 13 via the combustor steam pipe 21 and is used to increase the output of the gas turbine 11. Excess steam is supplied to the steam customer 91 through the steam distribution pipe 22 and used as process steam.

  The exhaust gas that has passed through the exhaust heat recovery boiler 20 is guided to the moisture recovery device 41 and cooled by the sprayed cooling water. As a result, the moisture contained in the exhaust gas is condensed and stored in the water storage section of the moisture recovery device 41. The water thus recovered by the water recovery device 41 is sent to the radiator 42 via the water supply pipe 45 by the pump, radiated to the atmosphere and cooled, and then a part of the water is recovered as a refrigerant via the refrigerant pipe 46. It is supplied to the device 41 and sprayed on the exhaust gas, and a part thereof is replenished to the water storage part of the moisture recovery device 41 via the replenishing water pipe 47. Further, the remaining recovered water cooled by the radiator 42 is guided to the water treatment facility 43 through the water supply pipe 48 and purified, and temporarily stored in the water storage tank 44. Part of the water stored in the water storage tank 44 is supplied to the exhaust heat recovery boiler 20 as a steam source through a water supply pipe 48 by a pump, and the surplus is distributed to a water consumer 92 through a water pipe 49 to be used as drinking water. It is used as various irrigation water.

  The exhaust gas from which the moisture has been recovered and discharged from the moisture recovery device 41 is guided to the reheater 50, and is again heated to a specified temperature or higher by heat exchange with some steam generated in the exhaust heat recovery boiler 20. It is released into the atmosphere above. The steam heated by the reheater 50 is returned to the exhaust heat recovery boiler 20.

10. Effects (1) Appropriateness for an area where water sources are scarce According to the present embodiment, the gas turbine 11 is enhanced in output by injecting a large amount of steam generated in the fuel cell 30 into the compressed air for fuel. Water can be continuously fed into the fluid circulation system containing the water. The water supplied by the fuel cell 30 is recovered by the water recovery device 41, cooled by the radiator 42, and circulated and used as cooling water for the water recovery device 41, steam for increasing the output of the gas turbine 11, and the like. Since the radiator 42 is air-cooled, it does not require seawater or river water as a heat radiation source. For example, although a steam turbine can be used as the steam consumer 91, high power generation efficiency can be ensured as in a combined cycle or AHAT without using a steam turbine. Since the steam turbine can be omitted, the condensate system of the steam turbine can also be omitted. Moreover, since the high output enhancement effect by humidification is acquired, the gas turbine 11 can also be enlarged. In addition, since a large amount of moisture is given from the fuel cell 30 in the compressed air compressed by the compressor 12 through the fuel cell 30, a configuration in which moisture is sprayed on a plurality of stages of the compressor in the AHAT. The complicated spraying apparatus is also unnecessary.

  According to the water-saving combined power generation system according to the present embodiment, as described above, the gas turbine power generation system 10, the exhaust heat recovery boiler 20, the fuel cell 30, the water recovery system 40, and the like are highly related and synergistic. By acting on, it is possible to operate even in areas where water sources are scarce and to generate power with high efficiency.

(2) Contribution to peripheral equipment Further, it is difficult to recover 100% of the water contained in the working fluid of the gas turbine 11 and circulate without loss, but steam is continuously supplied from the fuel cell 30 to the system. Therefore, more moisture can be obtained to compensate for the loss. Excess water can be stored temporarily or for a long time, but can also be distributed to surrounding equipment. For example, as described above, the steam can be distributed to the steam customer 91 as process steam. In this case, the production activity of facilities such as factories around the plant can be supported, thereby contributing to the development of the industry. Moreover, it can also distribute as water etc. to water consumers 92, such as a factory, a store, a farm, and a general household, and in this case, it can become a valuable water supply source in an area where water sources are scarce.

(3) Flexibility of operation According to the present embodiment, since the gas turbine side valve group and the fuel cell side valve group are provided, either the gas turbine side valve group or the fuel cell side valve group is closed. Thus, the power generation operation can be performed with only one of the gas turbine power generation system 10 and the fuel cell 30. For example, in order to start the fuel cell 30, it is necessary to warm up the electrolyte to a high operating temperature (for example, about 900 to 1000 ° C.). Therefore, when the gas turbine power generation system 10 and the fuel cell 30 are started together, the startup time become longer. In such a case, from the viewpoint of shortening the starting time, the fuel cell side valve group can be closed and the gas turbine side valve group can be started at a high speed by controlling the opening degree. A DSS (Daily Start Stop) function is provided by independent operation of the gas turbine power generation system 10, and the power generation amount can be flexibly adjusted according to fluctuations in the required power generation output.

  On the other hand, at the time of maintenance of the gas turbine power generation system 10 or the fuel cell 30, either one of the gas turbine side valve group or the fuel cell side valve group is closed, and the single operation of either the gas turbine power generation system 10 or the fuel cell 30 is performed. Thus, maintenance of the gas turbine power generation system 10 or the fuel cell 30 can be performed while power generation is continued.

(Second Embodiment)
FIG. 2 is a system diagram of a water-saving combined power generation system according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals in FIG.

  The present embodiment is different from the first embodiment in that a fuel cell inlet steam pipe 80 is added. The fuel cell inlet steam pipe 80 branches from the combustor steam pipe 21, and connects the exhaust heat recovery boiler 20 and the fuel cell 30 via the combustor steam pipe 21. Thereby, a part of the steam flowing through the combustor steam pipe 21 is supplied to the fuel supplied to the fuel cell 30, and the steam generated in the exhaust heat recovery boiler 20 is added to the fuel supplied to the fuel cell 30. . The fuel cell inlet steam pipe 80 is provided with a valve 75. The valve 75 belongs to the fuel cell side valve group. Other configurations are the same as those of the first embodiment.

  According to the present embodiment, the same effect as that of the first embodiment can be obtained, and the fuel recovered from the exhaust gas can be supplied to the fuel of the fuel cell by heating the fuel, for example. The power generation efficiency of 30 can be improved.

DESCRIPTION OF SYMBOLS 10 Gas turbine power generation system 12 Compressor 13 Combustor 14 Turbine 15 Generator 16 Combustor fuel pipe 17 Combustor air pipe 20 Exhaust heat recovery boiler 21 Combustor steam pipe 22 Steam distribution pipe 30 Fuel cell 31 Fuel cell fuel pipe 32 Fuel Battery air pipe 34 Waste fuel pipe 35 Fuel cell outlet steam pipe 40 Moisture recovery system 41 Moisture recovery device 42 Radiator 43 Water treatment facility 46 Refrigerant pipe 48 Water supply pipe 49 Moisture pipes 61 and 62 Valves (valves on the gas turbine power generation system side) )
71-75 Valve (Fuel cell side valve group)
80 Fuel cell inlet steam pipe 91 Steam customer 92 Water customer

Claims (9)

A gas turbine power generation system having a compressor, a combustor, a turbine and a generator;
A fuel cell;
A fuel cell air pipe for connecting the compressor and the fuel cell and supplying compressed air to the fuel cell;
An exhaust fuel pipe that connects the fuel cell and the combustor and guides the exhaust fuel of the fuel cell to the combustor;
A fuel cell outlet steam pipe for connecting the fuel cell and the combustor and adding the steam generated in the fuel cell to the compressed air supplied to the combustor;
A moisture recovery system for recovering moisture from the exhaust gas of the turbine;
An exhaust heat recovery boiler for generating steam by exchanging heat between the moisture recovered by the moisture recovery system and the exhaust gas of the turbine;
A combustor steam pipe that connects the exhaust heat recovery boiler and the combustor and adds steam generated by the exhaust heat recovery boiler to compressed air supplied to the combustor. Water-type combined power generation system. The water-saving combined power generation system according to claim 1,
A water-saving combined power generation system, wherein the fuel cell is a solid oxide fuel cell. The water-saving combined power generation system according to claim 1,
The moisture recovery system includes:
A moisture recovery device that recovers moisture of the exhaust gas of the gas turbine that has passed through the exhaust heat recovery boiler;
An air-cooled radiator that cools the moisture recovered by the moisture recovery device;
A refrigerant pipe that connects the radiator and the moisture recovery device and supplies the moisture cooled by the radiator as a refrigerant to the moisture recovery device;
A water-saving combined power generation system comprising: a water supply pipe that supplies the water recovered by the water recovery device as a steam source to the exhaust heat recovery boiler. The water-saving combined power generation system according to claim 1,
A water-saving combined power generation comprising a steam distribution pipe that connects the exhaust heat recovery boiler and a steam customer and supplies the steam surplus generated by the exhaust heat recovery boiler to the steam customer system. The water-saving combined power generation system according to claim 1,
Moisture piping that connects the water recovery device and a water consumer and supplies the water recovered by the water recovery device to the water consumer;
A water-saving combined power generation system comprising a water treatment facility for purifying water supplied to the water consumer. The water-saving combined power generation system according to claim 1,
A combustor air tube for supplying compressed air from the compressor to the combustor;
A combustor fuel pipe for supplying fuel to the combustor;
A fuel cell fuel pipe for supplying fuel to the fuel cell;
A valve group on the gas turbine power generation system side including a plurality of valves respectively provided in the combustor air pipe and the combustor fuel pipe;
A water-saving combined power generation system comprising: the fuel cell air pipe; and a fuel cell side valve group including a plurality of valves respectively provided in the fuel cell fuel pipe. The water-saving combined power generation system according to claim 1,
A water saving apparatus comprising a fuel cell inlet steam pipe for connecting the exhaust heat recovery boiler and the fuel cell and adding the steam generated by the exhaust heat recovery boiler to the fuel supplied to the fuel cell. Type combined power generation system. The water-saving combined power generation system according to claim 7,
A combustor air tube for supplying compressed air from the compressor to the combustor;
A combustor fuel pipe for supplying fuel to the combustor;
A fuel cell fuel pipe for supplying fuel to the fuel cell;
A valve group on the gas turbine power generation system side including a plurality of valves respectively provided in the combustor air pipe, the combustor fuel pipe, and the combustor steam pipe;
A water-saving combined power generation system comprising: a fuel cell side valve group including a plurality of valves provided in the fuel cell air pipe, the fuel cell fuel pipe, and the fuel cell inlet steam pipe, respectively.   9. Either one of the valve group on the gas turbine power generation system side and the valve group on the fuel cell side of the water-saving combined power generation system of claim 6 or 8 is closed, and either the gas turbine power generation system or the fuel cell is closed. Operation method of water-saving combined power generation system that generates electricity only by

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